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Forum Replies

  1. Udaya,
    A type-3 default route generated by an ABR into its directly attached totally stubby area is an exception to the no LSA type 3 rule. This is the only type-3 route allowed within an totally stubby area.

  2. Hello Yamini

    Rene’s lesson on types of stub areas very clearly indicates the functionality of each. You can find it here.

    However, I’ll try to give you a quick summary of why you would use each case in a real life scenario.

    A stub area would be configured if a network segment had only one choice for routing all traffic. An example of this would be a branch office that has only one gateway. There is no need for LSAs of type 5 to be advertised within this network since all routes will point to the local default gateway.

    A totally stubby area would be configure

    ... Continue reading in our forum

  3. Let me use another topology to explain where/why you could use stub areas:


    OSPF is our “campus” network. Area 0 is the main network, area 1,2, and 3 are branch offices. BGP routes are redistributed into OSPF, RIP routes are also redistributed into OSPF.

    With regular areas, all routers will learn about all prefixes out there. When you look at this picture…why would area 1, 2, or 3 need to know the prefixes from BGP? There is only one path, and that is t

    ... Continue reading in our forum

  4. ah don’t do that Rene you already are very responsive and take care of the website. Save your time for important stuff it was small inconvenience only I just glossed over the names and focused on specific granular that I was having problems with but makes

    ... Continue reading in our forum

  5. Hi Rene,
    That was mind blowing. Clear concept indeed . The stub/Totally Stub concerned to how many exit point from a area .The NSSA/Totally NSSA needed when ASBR needed on a area .Thx


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